Finding the Fourth Proportional to 12,399.60, 17,110.98 and 7,683.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.60 : 17,110.98 = 7,683.78 : x
2. Step 2: Convert to fraction form
   12,399.60/17,110.98 = 7,683.78/x
3. Step 3: Cross multiply
   12,399.60x = 17,110.98 × 7,683.78
4. Step 4: Simplify right side
   12,399.60x = 131,477,005.90
5. Step 5: Solve for x
   x = 131,477,005.90/12,399.60
6. Step 6: Final answer
   x = 10,603.33